dropdownchoice onchange event called before propertymodel updates

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dropdownchoice onchange event called before propertymodel updates

Matthew Goodson
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I have a dropdownchoice which determines what details that a form holds. The problem that I am having is that the ajax event is being called before the property model updates the field. So the addVehicleFormPanel is being rendered with the old value and now the new selected one.
Hopefully that makes sense.
I am a bit of a newbie to wicket so dumb it down if you can.
Any help is very much appreciated. Thanks

DropDownChoice<Vehicle> vehiclesDropDown = new DropDownChoice<Vehicle>(
        "vehicleSelect", new PropertyModel<Vehicle>(this, "selectedVehicle"),
        new PropertyModel<List<Vehicle>>(user, "vehicles"),
        new WebOptionStringChoiceRender<Vehicle>())

vehiclesDropDown.add(new AjaxFormComponentUpdatingBehavior("onchange") {
        private static final long serialVersionUID = 1L;
                protected void onUpdate(AjaxRequestTarget target) {